Hondata

Hi guys,

We've struck a bit of a problem with our race car and was hoping someone could help on other things to check.

Just a bit of back ground, we tested and qualified and engine was fine, quicker than previous and pulling well.

After qualifying car wouldn't start and battery was drained, alternator was the issue, replaced and all ok battery charging again.

Now we go out for race 1 and the car is 7mph down on previous and flat. 120 down straight in qually 112/113 in race.

We checked absolutely everything we can think of, one thing to note is the car is very lean almost like it's not switching to the high fuel tables.

Things checked so far:

Compression 230 psi across all four
Timing - perfect
Clearences - perfect
Fuel pressure - perfect
Vtec is operating but sounds flat on engagment
Oil pressure is fine
Oil level is fine
Coolant temp fine
IAT fine
VSS working
VTC following requests
Map Sensor working
Air filter not blocked
Vtec solonoid operating
Tried a different kpro and ecu no different

We're stumped any ideas welcome, as said it is running very lean which it wasn't on the dyno, which is what leads us to believe that were not switching to high load fuel table when vtec comes in, not sure how we can check this.

Modifications:

3" exhaust / Toda Manifold / Toda A3 Cams / Toda Valve Springs / RDX 410CC injectors / Skunk2 ultra street Intake Manifold / Skunk2 throttle body. Idle disabled, all safety compensations disabled (we know this is dangerous but dash reads everything has alarms)

Thanks in advance.

Map attached and datalog. (Datalog are from car on axle stands holding under load using brakes)

Open the calibration and the datalog file and use the graph window, use the slider and you will see were it's switching to the high fuel table.
I'm not a expert at all but it looks like it's switching normal to me.
How do you know it's running lean, there is no AFR sensor input? Closed loop is also disabled which might not be a very smart thing.
There is an active error code for high battery voltage, might be worth looking in to.

Plugs were new and are now white, that's how we knew it was lean.

Thanks for taking a look. Never had an issue like this we can't pinpoint. Feel like we've tried everything.